| http://www.w3.org/ns/prov#value | - tal part of the production process from a quality-assurance point of view, as it gives confidence that the parts being tested won???t have defects in them that could cause problems in future life cycles.???The variety of techniques available can be roughly broken down into two areas: surface techniques, which are used to identify surface defects such as cracks and surface porosity, and sub-surface
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